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"use strict";

function findRelation_upToPath(urlObj, siteUrlObj, options)
{
	// Path- or root-relative URL
	var pathOnly = urlObj.extra.hrefInfo.minimumPathOnly;
	
	// Matching scheme, scheme-relative or path-only
	var minimumScheme = (urlObj.scheme===siteUrlObj.scheme || !urlObj.scheme);
	
	// Matching auth, ignoring auth or path-only
	var minimumAuth = minimumScheme && (urlObj.auth===siteUrlObj.auth || options.removeAuth || pathOnly);
	
	// Matching host or path-only
	var www = options.ignore_www ? "stripped" : "full";
	var minimumHost = minimumAuth && (urlObj.host[www]===siteUrlObj.host[www] || pathOnly);
	
	// Matching port or path-only
	var minimumPort = minimumHost && (urlObj.port===siteUrlObj.port || pathOnly);
	
	urlObj.extra.relation.minimumScheme = minimumScheme;
	urlObj.extra.relation.minimumAuth   = minimumAuth;
	urlObj.extra.relation.minimumHost   = minimumHost;
	urlObj.extra.relation.minimumPort   = minimumPort;
	
	urlObj.extra.relation.maximumScheme = !minimumScheme || minimumScheme && !minimumAuth;
	urlObj.extra.relation.maximumAuth   = !minimumScheme || minimumScheme && !minimumHost;
	urlObj.extra.relation.maximumHost   = !minimumScheme || minimumScheme && !minimumPort;
}



function findRelation_pathOn(urlObj, siteUrlObj, options)
{
	var queryOnly = urlObj.extra.hrefInfo.minimumQueryOnly;
	var hashOnly  = urlObj.extra.hrefInfo.minimumHashOnly;
	var empty     = urlObj.extra.hrefInfo.empty;	// not required, but self-documenting
	
	// From upToPath()
	var minimumPort   = urlObj.extra.relation.minimumPort;
	var minimumScheme = urlObj.extra.relation.minimumScheme;
	
	// Matching port and path
	var minimumPath = minimumPort && urlObj.path.absolute.string===siteUrlObj.path.absolute.string;
	
	// Matching resource or query/hash-only or empty
	var matchingResource = (urlObj.resource===siteUrlObj.resource || !urlObj.resource && siteUrlObj.extra.resourceIsIndex) || (options.removeDirectoryIndexes && urlObj.extra.resourceIsIndex && !siteUrlObj.resource);
	var minimumResource = minimumPath && (matchingResource || queryOnly || hashOnly || empty);
	
	// Matching query or hash-only/empty
	var query = options.removeEmptyQueries ? "stripped" : "full";
	var urlQuery = urlObj.query.string[query];
	var siteUrlQuery = siteUrlObj.query.string[query];
	var minimumQuery = (minimumResource && !!urlQuery && urlQuery===siteUrlQuery) || ((hashOnly || empty) && !urlObj.extra.hrefInfo.separatorOnlyQuery);
	
	var minimumHash = minimumQuery && urlObj.hash===siteUrlObj.hash;
	
	urlObj.extra.relation.minimumPath     = minimumPath;
	urlObj.extra.relation.minimumResource = minimumResource;
	urlObj.extra.relation.minimumQuery    = minimumQuery;
	urlObj.extra.relation.minimumHash     = minimumHash;
	
	urlObj.extra.relation.maximumPort     = !minimumScheme || minimumScheme && !minimumPath;
	urlObj.extra.relation.maximumPath     = !minimumScheme || minimumScheme && !minimumResource;
	urlObj.extra.relation.maximumResource = !minimumScheme || minimumScheme && !minimumQuery;
	urlObj.extra.relation.maximumQuery    = !minimumScheme || minimumScheme && !minimumHash;
	urlObj.extra.relation.maximumHash     = !minimumScheme || minimumScheme && !minimumHash;	// there's nothing after hash, so it's the same as maximumQuery
	
	// Matching path and/or resource with existing but non-matching site query
	urlObj.extra.relation.overridesQuery  = minimumPath && urlObj.extra.relation.maximumResource && !minimumQuery && !!siteUrlQuery;
}



module.exports =
{
	pathOn:   findRelation_pathOn,
	upToPath: findRelation_upToPath
};